A Method to Assess Dissaving Risk against Life Expectancy for Elderly People

In order to detect the capability deterioration of economic activity for single elderly people at age of sixty-five or over, characteristic expenditures are tried to be extracted. The data used are anonymous and obtained from the National Survey of Family Income and Expenditure carried out by Ministry of Internal Affairs and Communications in 2004. As a basis of economy activity, clustering is performed with five clusters having income and saving as feature values. We then develop a method to determine whether savings are enough for life expectancy in terms of income and saving. As a result of clustering, data (13 males, 48 females) determined as having dissaving risk are included in the corresponding clusters (32 males, 226 females) categorized as low or fairly low income and low saving. In the case distinguishing rent with own house and using four clusters having saving as feature value, Correct Detection Ratio (CDR) of elderly people determined as having dissaving risk is 66.7% (83.3%, 94.1% and 52.6%, respectively) for Male/Rent (Male/Own, Female/Rent and Female/Own). In the case disregarding rent and own house, CDR is 78.6% (65.5%, respectively) for male (female). For female, further consideration of clustering conditions results in improving CDR as high as 73.9%.